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finish hw02 #76

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finish hw02 #76

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Daydream0929
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  1. shared_ptr可能会导致循环引用，内存无法安全释放，因此采用一个unique_ptr和一个原始指针
  2. 自定义构造函数改用初始化表表达式，避免重复初始化
  3. 因为有了移动赋值函数和拷贝构造函数，删除拷贝赋值函数，当程序调用时编译器会先调用拷贝构造函数就地构造，然后调用移动赋值函数。

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